That is what I have been doing this past year...and now. I started a seed last March and let it grow naturally outside all summer. The clones I took from that plant once I determined it was female were vegetated in my grow box for about 3 months and then put out to flower in Oct. That plant made the best bud I have ever had. It really all depends on the daylight/night time hours. I'm not sure if you can veg inside and flower outside during the summertime, but during the fall/winter it works great for me. It also depends on the temps you have during the cooler/cold months. BTW, I'm in growing zone 10 and IMO the best conditions for flowering MJ are between Oct and Feb. I have another clone full into flower right now. I'm thinking it should be ready to harvest early to mid Feb. The buds are fat and some of the trichomes are clouding up.